our environment. [ sniffing ] [ seagulls squawking ] >> welcome back. here is what we know all about dzhokhar tsarnaev the suspect is still at large. he has been identified as a 900. his older brother was killed. both of them are from russia, and chechnya. they have been in the united states for a lease 10 years. this photo was taken on the robbery at a 711 and cambridge last night. >> this is what launched the events that happened last night. here are pictures there were taken from russia's version of facebook. they showed the second suspect police are looking for. >> there is also some you tube activity as well as drivers license photos. if they know exactly who they are looking for. he is considered to be extremely dangerous considering the fact that the two brothers led police on a chase after robbing a 711. they killed a m-i-t officer and a transit officer was injured. they also carjacked someone. they did let the driver go. he was unharmed. they were throwing bombs at the police officers and that is when the 26 year-old was killed. they stated that found explosives on his body.